THC was the prime factor.
Decision-making and THC Effects
On the day of the accident, aspects of the pilot's planning, flying technique and decision-making were inconsistent with regulatory and administrative requirements, the company operations manual policy and safe flying practices. These included VFR flight in marginal visual weather conditions, flight in IMC on a VFR flight plan, and overwater flight beyond gliding distance of land. The quantity of psychoactive components in the pilot's system is considered to have been sufficient to result in impairment of cognitive processes. This would likely have had an effect on planning and conduct of the accident flight. It is possible that the pilot, under the influence of cannabis, avoided the higher workload of IFR flight in IMC, choosing to remain visual for the trip to Lutsel K'e.